Heat riser valve delete

[Hector]

I have a few of these left over so I will take advantage of this new forum to advertize them.

The heat riser delete will eliminate the valve altogether while still retaining the geometry of the exhaust attachment point.The main body of the part is machined from round stock steel and the ears are flat bar construction and TIG welded on a fixture for good fitment.

Price for the part is $60.00 shipped in the US and Puerto Rico,others will be actual shipping included.PM or post here with any questions.Thanks.

http://i154.photobucket.com/albums/s260/Hecticblasts/Heat%20riser%20valve%20delete/heatriserdelete001.jpg
Here's a few old valves from 350,430 and 455 Buicks and the delete on the lower right.

http://i154.photobucket.com/albums/s260/Hecticblasts/Heat%20riser%20valve%20delete/heatriserdelete010.jpg
http://i154.photobucket.com/albums/s260/Hecticblasts/Heat%20riser%20valve%20delete/heatriserdelete009.jpg
http://i154.photobucket.com/albums/s260/Hecticblasts/Heat%20riser%20valve%20delete/heatriserdelete008.jpg
http://i154.photobucket.com/albums/s260/Hecticblasts/Heat%20riser%20valve%20delete/heatriserdelete007.jpg
These are detailed pictures of the part
http://i154.photobucket.com/albums/s260/Hecticblasts/Heat%20riser%20valve%20delete/heatriserdelete004.jpg
350 manifold with delete and gasket
http://i154.photobucket.com/albums/s260/Hecticblasts/Heat%20riser%20valve%20delete/heatriserdelete005.jpg
455 manifold with delete and gasket
http://i154.photobucket.com/albums/s260/Hecticblasts/Heat%20riser%20valve%20delete/heatriserdelete006.jpg
This is a gasket that I found to work for this application if the manifold surface is not nice and flat.The Gasket is not included with the purchase.

[waijo355]

Hi, what does this thing do? what does it replace? sorry, super noob.

[Hector]

Hi, what does this thing do? what does it replace? sorry, super noob.

It replaces the heat riser valve.Look at the first picture on the upper left,that's a complete valve out of a '76 455 Buick engine.The valve,as intended,routes hot exhaust gasses to the top of the engine during cold weather operation for faster starts and to keep the intake charge warm.The valve acomplishes that by closing the flapper,the problem is that after years of operation they deteriorate and get stuck in the closed position or only partially open creating an exhaust obstruction.For mild weather areas or for cars that only see good weather,some people just eliminate the valve altogether by either removing the flapper or using something like this item.

Not all vehicles were equipped with the heat riser valve,so if you don't have one there's no worries of it becoming stuck.For vehicles equipped with it,you will find it on the left side of the engine(driver's side)between the exhaust manifold and the exhaust pipe attached to it.Hope that answers your question.

[BigBlock68]

Is there a performance gain from eliminating the flap?

[Hector]

Is there a performance gain from eliminating the flap?

I like to think that eliminating the restriction to the exhaust path that the valve poses,even in the open position,should help performance somewhat.That's the reason that I made the pieces to begin with,I used to do a similar modification to the sbc's in my past life.Notice also that I made the internal diameter of the part slightly larger than that of the manifold in case that someone wanted to open it up a little,again,for improved exhaust path.

I can not make any claims as to the performance or lack of it that will come as a result of using the part since I have never tested or measured any engine's power before and after installation.I made the part for my own use and made a few extras in case anyone else wanted to replace an old defective valve or felt the same as I do about the stock part choking the left manifold's flow.To answer your question directly,I don't know.

Keep in mind also that there's a shool of tought that states that the heat riser should always be present on the engine in order for it to perform well.I will agree to that but only on a case by case application with the weather temp being the major factor in making that call.Then again,think headers.

[BigBlock68]

Oh, so it's more about eliminating the headache of the valve being stuck open?

[Smartin]

Or stuck closed..

[Hector]

Or stuck closed..

:TU:

[Steve Craig]

Hector,
My '71 doesn't have this valve. It's a US car from Texas. My Canadian GM Parts Book doesn't show it anywhere.
What applications was it put on as new?

[Hector]

Hector,
My '71 doesn't have this valve. It's a US car from Texas. My Canadian GM Parts Book doesn't show it anywhere.
What applications was it put on as new?

I don't know what criteria the factory used for the incorporation of the valve or which years.I believe that some models were built both with and without the valves on the same year.I know that both my '69 and '79 came with them as well as a '76 that I parted out a while back.Maybe the original destination of the vehicle dictated wether the valve was used or not,just my speculation.Perhaps someone else can shed some light in the subject.

[Smartin]

71's didn't have them, that's all I can confirm for sure.

[BigBlock68]

Or stuck closed..

My mistake. :Dou:

[sean Buick 76]

Great product! I have bought several 350s for dirt cheep with the owners claiming they were worn out and rattling.... Really the noise was the heat riser stock shut and flaping as the exhaust tried to push past! After I wired them open more power and no noise!!!

[Hector]

I had a chance to work on my '69 this past week and since it was sitting on jackstands I figured,if the bolts come loose I'll replace the valve with the delete and take a few pics.
I've been spraying some PB Blaster on the threads for the last year sporadically and the nuts and bolts all came off smoothly.Notice that somebody has been here before,they replaced a stud with a bolt and there was RTV on both mating surfaces of the valve and they also used a gasket.
http://i154.photobucket.com/albums/s260/Hecticblasts/HR%20delete%20install/001-1.jpg
The valve was stuck,not in the closed position but not open all the way either.
http://i154.photobucket.com/albums/s260/Hecticblasts/HR%20delete%20install/003.jpg
I decided not to use the gasket and used some Hi Temp RTV to coat the sealing surfaces.
http://i154.photobucket.com/albums/s260/Hecticblasts/HR%20delete%20install/005.jpg
http://i154.photobucket.com/albums/s260/Hecticblasts/HR%20delete%20install/006.jpg
The deed is done.If the nuts/bolts holding the exhaust pipes on the manifold come loose it is a 10-15 minute job to change the part.
http://i154.photobucket.com/albums/s260/Hecticblasts/HR%20delete%20install/007.jpg

[MGSCP]

ttt:gp:

[drspencer]

What is the purpose of the delete? Couldn't you simple remove the offending flapper, then bolt the pipe to the exhaust manifold?

Thanks

[Hector]

What is the purpose of the delete? Couldn't you simple remove the offending flapper, then bolt the pipe to the exhaust manifold?

Thanks

The delete is keeping the attachment point on the manifold for the pipe,you need the radiused surface for the pipe to seal.Without the valve or the delete there's only a flat surface on the manifold.

[drspencer]

The delete is keeping the attachment point on the manifold for the pipe,you need the radiused surface for the pipe to seal.Without the valve or the delete there's only a flat surface on the manifold.

Would a 71 350 come stock with a valve?

Thanks

[Hector]

Would a 71 350 come stock with a valve?

Thanks

According to Adam's post above,no.

[Bigpig455]

Is there any reason this plate woiuldnt work on a 401 Gran Sport? Are the manifolds the same ID as the 350/455 manifolds?

Rhett

[Hector]

Is there any reason this plate woiuldnt work on a 401 Gran Sport? Are the manifolds the same ID as the 350/455 manifolds?

Rhett

I did not have a NH manifold to compare when I was making these.I don't know the spacing for the studs on the NH ,the overall length or thickness of the part may be different,I just don't know.Can you PM me the dimensions from your valve?

[william.ali.kay]

Any update on fitting the 401?
Still avalible?

[Hector]

I still have a few of the parts left but no idea if it will fit the NH exhaust.

[bhambulldog]

It would be good to know; if, this will fit 322 and/or other nailheads.
I need to replace the gasket at the Roadmaster's Y pipe. I would like to get rid of the flapper at the same time.
Will I be the guinea pig?

[william.ali.kay]

Will I be the guinea pig?

Either you or me.

[Hector]

You guys need to get measuring,the big one is the stud spacing and the size of the stud.The other critical dimension is the overall thickness of the part,that will determine if it is a direct swap without altering the stock geometry(as my parts are for the 430-455,350).

[bhambulldog]

It would be good to know; if, this will fit 322 and/or other nailheads.
I need to replace the gasket at the Roadmaster's Y pipe. I would like to get rid of the flapper at the same time.
Will I be the guinea pig?


Either you or me.
It won't work on the 322". The 322" flapper assembly is integral to the exhaust manifold.

Now, I know the 401 uses a different manifold from the 322. So, will it work on the 401? :Do No:

[Gary Bohannon]

I have always hated those stupid things. I woud tap them open and wire them snug, never to move again. Sometimes I would take them apart and cut them out and drive soft bolts into the shaft holes.
I had a machinist make me one, very similar to the ones shown above. I have it on my 67 GS right now.
They really are bad on your car when stuck. Blocks almost all the driver side exhaust and forces it through the intake, super heats the poor ole carburetor and exits into the right side exhaust manifold.
Imposible to get power & gas milage,

[JSteele]

I machined the boss down on one years ago (don't remember if it was a buick) and drilled and tapped the hole for an O2 sensor.

[Race Lutz]

A bump for Hector............

[mkeeler]

Hector
Do you still have any of the spaceres left. I am interested in one.
Thanx Mike 772-834-6999

[Hector]

Hector
Do you still have any of the spaceres left. I am interested in one.
Thanx Mike 772-834-6999
Yes,I still have some left.PM me with any questions and a shipping address.

[Bobbyg]

Hector,
I am in need of a Heat Riser Replacement or "spacer". I saw your post and would sure like to have one. I have tried every where I can think to find something to work. Can you help me??

Bob

[Bobbyg]

[quote=Bobbyg;1883317]Hector,
I am in need of a Heat Riser Replacement or "spacer". I saw your post and would sure like to have one. I have tried every where I can think to find something to work. Can you help me??

Bob

[Bobbyg]

Hey Hector,
I need one of your Heat Riser Delete units. Let me know how to get one sent to me. My Heat Riser is shot and this seems like a great solution.

Thanks,

Bob Runner
513-753-6148

[Hector]

Bob,sorry about the delay responding,I've been on vacation and just got back.I will PM you with the details shortly.

[Bobbyg]

Thank you.

Bob

[wedunit]

Hector, I pm'd you with a request for a heat riser delete for my 430 earlier this afternoon.

406-644-4849

Thanks.

Larry

[chucks71]

Hector,

Any left for the 350? I pm'd you a few weeks ago with no response back. Let me know....

Thanks,
Chuck

[71Custom]

I would also like one for a 350 if you have any left?
thanks
Bill

[Hector]

Sorry to say that I am all out of the parts and will not be able to make any more for the forseeable future.

[71Custom]

thanks